Tandem disc harrow



Aug. 4, 1959 Filed July 3, 1957 H. F. MCCLESKEY 2,897,905

TANDEM DISC HARROW 5 Sheets-Sheet 1 INVENTOR 1 I I BY l 1 I4 ATTORNEYS.

g- 1959 H. F. MOCLESKEY 2,897,905

TANDEM DISC HARROW Filed July 3, 1957 5 Sheets-Sheet 2 fl f/C C165 KeyINVENTOR ATTORNEYS Aug. 4, 1959 Filed July 5, 1957 H. F. M CLESKEYTANDEM DISC HARROW 5 Sheets-$heet 3 bf ff? CZesiiey INVENTOR BY W-ATTORNEYS.

Aug. 4, 1959 H. F. MCCLESKEY 2,897,905

TANDEM DISC HARROW Filed July 5, 1957 5 Sheets-Sheet 4 H. E f/cC'Zesfi'ey INVENTOR BY W.

ATTORNEYS.

United States Patent: Ofiice 2,897,905 Patented Aug. 4,

2,897,905 TANDEM DISC HARRow Henry F. McCleskey, Marietta, Ga.

Application July 3, 1957, Serial No. 669,748

1 Claim. (Cl. '172--581) This invention relates to disc harrowconstruction and more particularly to disc harrow construction of thtandem type.

An important object of the invention is to provide a harrow embodying apair of pivotally connected discgang sections with adjusting meanswhereby the angle of operation of the discs may be varied to meet therequirements of use and without the necessity of using wrenches or othertools. 1

An object of the invention is to provide a disc harrow of the tandemtype wherein the rear disc gang section may be swung vertically out ofcontact with the ground surface with the result that the weight of therear section will be carried by the front section resulting in a deeperpenetration when using the front section only as a harrow.

A still further object of the invention is to provide disc harrowsection frames which are provided with horizontal supporting armsadjustable to various angular positions with respect to the side railsof the frame to vary the angle of operation of the discs, the discsbeing arranged in groups which may be readily and easily removed andreversed for a particular use. 7

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts, hereinafter more fully describedand pointed out in the claim, it being understood that changes may bemade in the construction and arrangement of parts without departing fromthe spirit of the invention as claimed.

Referring to the drawings:

Figure 1 is a plan view of a tandem disc harrow constructed inaccordance with the invention.

Fig. 2 is a side elevational view thereof.

Fig. 3 is a front elevational view thereof.

Fig. 4 is a rear elevational view of the harrow.

Fig. 5 is an enlarged plan view of the tandem disc harrow frames withthe disc-gangs removed.

Fig. 6 is a sectional View taken on line 66 of Fig. 1.

Fig. 7 is a sectional view taken on line 7--7 of Fig. 1.

Fig. 8 is a fragmentary sectional view taken on line 8-8 of Fig. 4.

Referring to the drawings in detail, the harrow comprises the forwardsection 5 and a rear section 6, the section 5 being provided with ahitch 7 by means of which the harrow may be attached to a tractor. Thehitch comprises bearings 8 secured to the forward bar 9 of the forwardharrow section, the arms 10 of the hitch extending vertically, as shownby Fig. 4 of the drawings. Pivotally connected between the arms 10 is abearing 11 formed on one end of the rod 12, which rod 12 has threads 13threaded into one end of the turnbuckle 14. Rod 15 has its threaded end16 also threaded in the turnbuckle 14 so that by rotating the turnbuckle14 through the medium of the rod 17, the angle of the pitch may bevaried to adapt it for attachment to tractors of various designs.

The rod 15 is provided with the bearing 18 that operates in bearingopenings in the members 19 that extend upwardly from the bar 20' of theforward harrow section.

The bars 9 and 20 of the forward harrow section connect with the endbars 21 which have upper and lower rear harrow section to the forwardharrow section.- As' better shown by Fig. 1 of the drawings, spacedplates 23 are welded to the upper and lower portions of extended ends 22and lie on opposite sides of the end bars 21, the end bars 21 and spacedplates 23 being provided with registering openings to receive theconnecting pins 24 and 25, which may be removed and replaced at will ofthe operator. Thus it will be seen that due to this construction, theharrow sections may be connected and the harrow used as a tandem discharrow, or the rear pins 25 may be removed and the rear section swungupwardly so that the weight of the rear section is supported by thefront section adding weight to the front section, to cause the discs tobe hereinafter more fully described, to penetrate deeper than undernormal conditions.

It might be further stated that by removing the rear pins 25, the rearsection of the harrow will be permitted to float and followirregularities in the ground surface being cultivated or harrowed. Eachharrow section includes a central horizontal bar 26 that providessupports for the upper and lower plates 27 that are mounted against theupper and lower surfaces of the central horizontal bars of the sections.The reference character 29 indicates the supporting bars for thedisc-gang sections, which bars are pivotally connected at their innerends between said plates 27, said bars 29 resting between the end bars21 that are spaced apart a distance to receive the bars 29 for limitedsliding movement. Rising from the central portion of each of the plates27 is an internally threaded bearing 31 through which the threaded endof the adjusting screw 32 extends, the adjusting screw being rotatablymounted in the bearing means 18, 19

associated therewith so that rotation of the screw 32 of each harrowsection, will result in movement of plates 27 to move the inner ends ofbars 29 to vary the angle of the bars 29 with respect to the end bars ofthe harrow frame sections and consequently vary the angle of operationof the disc harrow blades supported by the bars 29.

Connected with one end of the adjusting screw 32 of each harrow section,is an operating rod 34 effecting rotation of the adjusting screw toaccomplish the adjustment of the inner ends of the bars 29 and providingan adjustment for the bars 29 to be made without the use of wrenches orthe like. The harrow gangs are indicated generally by the referencecharacter 35, each of which embodies a horizontal shaft 36 that operatesin bearings 37 formed at the lower ends of the arms 38, thearms 38having right-angle ends 39 that are fitted against the lower surfaces ofthe bars 29 where they are securely bolted to the arms 29 by means ofU-shaped bolts 40. Thus, it will be seen that the disc-harrowblade-gangs may be readily and easily removed and reversed to change theangle of operation of the discs to suit individual conditions.

The disc blades indicated by the reference character 41 are mounted onthe shaft 36 and spaced apart by means of the spacers 42 which are heldin place by cotter keys. In view of the fact that the front and rearharrow sections are identical, the forward section only of the harrow,has been described in detail.

What is claimed is:

A disc harrow comprising a frame including a front section and a rearsection, each of said sections including an outer cross bar, an innercross bar, and side bars,

means detachably securing said side bars in aligned rela- 6011, saidmeans including a pivot whereby upon release of the detachable securingmeans said rear section may be pivotally swung over said frontsection, acenter bar in each section, plates movably mounted on each center Bar,horizontal bars pivoted at their ends to said plates, means movablyconnecting said horizontal bars at an intermediate point to said sidebars, a threaded bar on each plate, a second bar on a cross bar of eachsection, a threaded IOd' extending through each second bar and engagingeach threaded bar, a handle on each threaded rod for moving itsassociated plate to vary the angle of its associated horizontal bar anddisc harrows supported by each horizontal bar.

References Cited in the file of this patent UNITED STATES PATENTS

